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    Subject[PATCH v2 0/9] avoid allocation in show_numa_map()
    Hi all,

    This is version 2 of a patch series[1] aimed at removing repeated
    allocation/free cycles happening in show_numa_maps() while we hold a reference
    to an mm. The concern is that performing an allocation while referencing an mm
    could lead to a stalemate in the oom killer as previously explained by Hugh

    This series addresses all issues raised in the previous round and is organized
    as follows:

    Patches 1-6 convert show_numa_maps() to use the generic walk_page_range()
    functionality instead of the mempolicy.c specific page table walking logic.
    Also, get_vma_policy() and mpol_to_str() are exported. This makes the
    show_numa_maps() implementation independent of mempolicy.c.

    Patch 7 moves show_numa_maps() and supporting routines over to

    Finally, patches 8 and 9 provide minor cleanup and eliminate the troublesome

    These patches are based on mmotm-2011-05-12-15-52 and have been tested on a
    dual node NUMA machine.




    Changes since v1:
    - Fix compilation error when CONFIG_TMPFS=n.

    - Traverse pte's with proper locking and checks.

    Stephen Wilson (9):
    mm: export get_vma_policy()
    mm: use walk_page_range() instead of custom page table walking code
    mm: remove MPOL_MF_STATS
    mm: make gather_stats() type-safe and remove forward declaration
    mm: remove check_huge_range()
    mm: declare mpol_to_str() when CONFIG_TMPFS=n
    mm: proc: move show_numa_map() to fs/proc/task_mmu.c
    proc: make struct proc_maps_private truly private
    proc: allocate storage for numa_maps statistics once

    fs/proc/internal.h | 7 ++
    fs/proc/task_mmu.c | 204 ++++++++++++++++++++++++++++++++++++++++++++-
    include/linux/mempolicy.h | 7 +-
    include/linux/proc_fs.h | 8 --
    mm/mempolicy.c | 164 +-----------------------------------
    5 files changed, 215 insertions(+), 175 deletions(-)

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